<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #result{
            width: 200px;
            height: 100px;
            border: solid 1px #234;
        }
    </style>
</head>
<body>
    <button>点击发送请求</button>
    <div id="result"></div>
    <script>
        const btn = document.querySelector('button')
        const result = document.querySelector('#result')
        btn.addEventListener('click',function(){
            const xhr = new XMLHttpRequest
            // 加一个时间戳解决ie缓存问题
            xhr.open('GET','http://127.0.0.1:8000/ie?t='+Date.now())
            xhr.send()
            xhr.onreadystatechange = function(){
                if(xhr.readyState === 4){
                    if(xhr.status>=200&&xhr.status<300){
                        result.innerHTML = xhr.response
                    }
                }
            }

        })
    </script>
</body>
</html>